Effective Pb2+ removal from water using nanozerovalent iron stored 10 months

Abstract

Heavy metal removal from water required reliable and cost-effective considerations, fast separation as well as easy methodology. In this piece of research, nanozerovalent iron (NZVI) was prepared as ideal sorbent for Pb 2? removal. The sample was characterized using X-ray diffraction (XRD), high-resolution transmission electron microscope (HRTEM), and atomic force microscope (AFM-SPM). Batch experiments comprised the effect of pH value and contact time on the adsorption process. The same NZVI was stored for a shelf time (10 months) and the batch experiment was repeated. The outcomes of the investigation assured that NZVI publicized an extraordinary large metal uptake (98%) after a short contact time (10 h). The stored sample revealed the same effectiveness on Pb 2? removal under the same conditions. The results of the physical properties, magnetic susceptibility, and conductance were correlated with the adsorption efficiency. This work offers evidence that these NZVI particles could be potential candidate for Pb 2? removal in large scale, stored for a long time using a simple, green, and cost-effective methodology, and represent an actual feedback in waste water treatment.

Functionalization of nZVI nanoparticles with dipicolinic acid by one-pot synthesis ­and testing of PDCA-nZVI material properties in cadmium removal from water

“…The resulting spectra are showed in Figure 2 the use of ethanol, iso-propanol is also described as a protective layer for nZVI particles [25]. The stability of stored particles is recently studied by Ahmed and authors who showed that extended storage with no corrosion on nZVI particles was achieved using polyvinyl pyrrolidone [4]. We observed the same and unchanged XRD pattern of ethanolic suspension after one month from preparation.…”

“…Zeta-potential of incubated PDCA-nZVI showed negative values. By comparing the obtained results with the study on Pb removal using nZVI particles [4], where the changes in surface charge was examined, we could find some common ground. This is because of very [25].…”

“…High reactivity and large surface area of environment-friendly and cost-effective nZVI particles are mostly exploited in removal of heavy metals and organic pollutants from water and soil systems [1][2][3]. Due to core-shell structure of nZVI particles, the removal of pollutants occurs through mechanisms of adsorption, reduction and complexation [4][5][6]. However, the strong agglomeration potential and rapid sedimentation complicate handling and applicability of nZVI particles in remediation purposes [7,8].…”

Nano zero valent iron (nZVI) particles for the removal of heavy metals (Cd2+, Cu2+ and Pb2+) from aqueous solutions

“…Lead metal ion removal experiment from wastewater has indicated that the pH of the solution where lead ion is found affects the state or species of nZVI adsorbent used for adsorption; at lower pH, the surface oxide layer is positively charged where it is dominated by protonated ions and attract only the positive ions, whereas at higher pH its surface becomes negatively charged and forms surface complexes with heavy metals such as Cd, Cu, Pb and others. 50 In the report, it was justified that increasing contact time, pH and nZVI dose increases the removal of the contaminant. However, adsorbate concertation has an inverse relation with the removal capacity.…”

“…However, adsorbate concertation has an inverse relation with the removal capacity. Ahmed et al (2017) 50 have reported about 98% of lead removal from water after 10 hours of contact time. The authors reported that the physical properties, magnetic susceptibility, and conductance of nZVI were correlated with adsorption efficiency.…”